@article{
 title = {The role of He in enhancing the intensity and lifetime of H and D emissions from laser-induced atmospheric-pressure plasma},
 type = {article},
 year = {2009},
 identifiers = {[object Object]},
 volume = {105},
 id = {84bbec0a-b30f-3051-82b5-0c1101882e05},
 created = {2018-11-01T17:24:48.230Z},
 file_attached = {false},
 profile_id = {6c08603e-f5fc-34c8-a4d1-319cca2e54f4},
 group_id = {18670495-6d76-3294-a982-97e5d10d5ff5},
 last_modified = {2018-11-01T17:24:48.230Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Kurniawan2009},
 private_publication = {false},
 abstract = {A series of measurements have been performed on the time dependences of the intensities of helium, hydrogen, and deuterium emission lines from the corresponding laser-induced helium plasma at atmospheric pressure for two different He flow rates. The prolonged H? and H ? emissions along with their constant intensity ratio over a relatively extended period indicate the need to provide an alternative excitation mechanism other than the well-known thermal excitation process in a hot plasma. This additional excitation mechanism is also related to the metastable excited state of a He atom as indicated by the similar characteristics of the observed time dependence of the emission intensities. The enhanced intensity and lifetime of He emission at a high He flow rate was explained in terms of the collision-induced increase in the number of He atoms excited to above the 2 1S0 metastable state, which was also responsible for the delayed excitation of H and D atoms via an energy transfer mechanism involving a Penning-like chemi-ionization process. Finally, the benefits of He-assisted delayed excitation of H and D atoms and the aforementioned enhanced intensity and lifetime at a high He flow rate were demonstrated by the achievement of clearly resolved H? and D? emission lines. ? 2009 American Institute of Physics.},
 bibtype = {article},
 author = {Kurniawan, Koo Hendrik and Lie, Tjung Jie and Suliyanti, Maria Margaretha and Hedwig, Rinda and Pardede, Marincan and Ramli, Muliadi and Niki, Hideaki and Abdulmadjid, Syahrun Nur and Idris, Nasrullah and Lahna, Kurnia and Kusumoto, Yoshihumi and Kagawa, Kiichiro and Tjia, May On},
 journal = {Journal of Applied Physics},
 number = {10}
}

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The prolonged H? and H ? emissions along with their constant intensity ratio over a relatively extended period indicate the need to provide an alternative excitation mechanism other than the well-known thermal excitation process in a hot plasma. This additional excitation mechanism is also related to the metastable excited state of a He atom as indicated by the similar characteristics of the observed time dependence of the emission intensities. The enhanced intensity and lifetime of He emission at a high He flow rate was explained in terms of the collision-induced increase in the number of He atoms excited to above the 2 1S0 metastable state, which was also responsible for the delayed excitation of H and D atoms via an energy transfer mechanism involving a Penning-like chemi-ionization process. 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